Gasket match- worth it??

From my limited knowledge, it's my understanding that if the port size is larger on the intake it can cause turbulent air as it progresses into the heads from hitting the shelf that surrounds the ports.. If the intake ports are smaller than the head ports not as big an issue.

If you do gasket match, it's recommended that you follow the match down into the head a bit to create a smooth transition. You have to be careful not to take to much and break through.

Hopefully someone will chime in and correct me if I'm off base here.

I have done tons of reading on the subject as I have a set of J heads I'm going to port in the near future. (fingers crossed, lol)